tests/test-http

findrenames: Optimise "addremove -s100" by matching files by their SHA1 hashes.

We speed up 'findrenames' for the usecase when a user specifies they
want a similarity of 100% by matching files by their exact SHA1 hash
value. This reduces the number of comparisons required to find exact
matches from O(n^2) to O(n).

While it would be nice if we could just use mercurial's pre-calculated
SHA1 hash for existing files, this hash includes the file's ancestor
information making it unsuitable for our purposes. Instead, we calculate
the hash of old content from scratch.

The following benchmarks were taken on the current head of crew:

addremove 100% similarity:
  rm -rf *; hg up -C; mv tests tests.new
  hg --time addremove -s100 --dry-run

  before:  real 176.350 secs (user 128.890+0.000 sys 47.430+0.000)
  after:   real   2.130 secs (user   1.890+0.000 sys  0.240+0.000)

addremove 75% similarity:
  rm -rf *; hg up -C; mv tests tests.new; \
      for i in tests.new/*; do echo x >> $i; done
  hg --time addremove -s75  --dry-run

  before: real 264.560 secs (user 215.130+0.000 sys 49.410+0.000)
  after:  real 218.710 secs (user 172.790+0.000 sys 45.870+0.000)

#!/bin/sh

cp "$TESTDIR"/printenv.py .

hg init test
cd test
echo foo>foo
mkdir foo.d foo.d/bAr.hg.d foo.d/baR.d.hg
echo foo>foo.d/foo
echo bar>foo.d/bAr.hg.d/BaR
echo bar>foo.d/baR.d.hg/bAR

hg commit -A -m 1
hg serve -p $HGPORT -d --pid-file=../hg1.pid
hg --config server.uncompressed=False serve -p $HGPORT1 -d --pid-file=../hg2.pid
# Test server address cannot be reused
hg serve -p $HGPORT1 2>&1 | sed -e "s/abort: cannot start server at ':$HGPORT1':.*/abort: cannot start server at ':\$HGPORT1':/"
cd ..
cat hg1.pid hg2.pid >> $DAEMON_PIDS

echo % clone via stream
hg clone --uncompressed http://localhost:$HGPORT/ copy 2>&1 | \
  sed -e 's/[0-9][0-9.]*/XXX/g' -e 's/[KM]\(B\/sec\)/X\1/'
hg verify -R copy

echo % try to clone via stream, should use pull instead
hg clone --uncompressed http://localhost:$HGPORT1/ copy2

echo % clone via pull
hg clone http://localhost:$HGPORT1/ copy-pull
hg verify -R copy-pull

cd test
echo bar > bar
hg commit -A -d '1 0' -m 2
cd ..

echo % pull
cd copy-pull
echo '[hooks]' >> .hg/hgrc
echo 'changegroup = python ../printenv.py changegroup' >> .hg/hgrc
hg pull | sed -e "s,:$HGPORT1/,:\$HGPORT1/,"
cd ..